Copy license and notice files when checking out a plugin

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@115525 13f79535-47bb-0310-9956-ffa450edef68

plugin-parent/maven.xml

@@ -28,6 +28,8 @@
     <ant:mkdir dir="${dir}/maven-plugins/plugin-parent" />
     <ant:copy todir="${dir}/maven-plugins/plugin-parent" file="${pom.parent.file}" />
     <ant:copy todir="${dir}/maven-plugins/plugin-parent" file="${pom.parent.file.parent}/project.properties" />
+    <ant:copy todir="${dir}/maven-plugins" file="${pom.parent.file.parent}/../LICENSE.txt" />
+    <ant:copy todir="${dir}/maven-plugins" file="${pom.parent.file.parent}/../NOTICE.txt" />
   </postGoal>
 
 </project>